source: trunk/sources/HeuristicLab.Selection/3.3/BestSelector.cs @ 7259

Last change on this file since 7259 was 7259, checked in by swagner, 11 years ago

Updated year of copyrights to 2012 (#1716)

File size: 3.0 KB
Line 
1#region License Information
2/* HeuristicLab
3 * Copyright (C) 2002-2012 Heuristic and Evolutionary Algorithms Laboratory (HEAL)
4 *
5 * This file is part of HeuristicLab.
6 *
7 * HeuristicLab is free software: you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation, either version 3 of the License, or
10 * (at your option) any later version.
11 *
12 * HeuristicLab is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
15 * GNU General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with HeuristicLab. If not, see <http://www.gnu.org/licenses/>.
19 */
20#endregion
21
22using System.Collections.Generic;
23using System.Linq;
24using HeuristicLab.Common;
25using HeuristicLab.Core;
26using HeuristicLab.Data;
27using HeuristicLab.Optimization;
28using HeuristicLab.Persistence.Default.CompositeSerializers.Storable;
29
30namespace HeuristicLab.Selection {
31  /// <summary>
32  /// A selection operator which considers a single double quality value and selects the best.
33  /// </summary>
34  [Item("BestSelector", "A selection operator which considers a single double quality value and selects the best.")]
35  [StorableClass]
36  public sealed class BestSelector : SingleObjectiveSelector, ISingleObjectiveSelector {
37    public BestSelector() : base() { }
38    [StorableConstructor]
39    private BestSelector(bool deserializing) : base(deserializing) { }
40    private BestSelector(BestSelector original, Cloner cloner)
41      : base(original, cloner) {
42    }
43    public override IDeepCloneable Clone(Cloner cloner) {
44      return new BestSelector(this, cloner);
45    }
46
47
48    protected override IScope[] Select(List<IScope> scopes) {
49      int count = NumberOfSelectedSubScopesParameter.ActualValue.Value;
50      bool copy = CopySelectedParameter.Value.Value;
51      bool maximization = MaximizationParameter.ActualValue.Value;
52      ItemArray<DoubleValue> qualities = QualityParameter.ActualValue;
53      IScope[] selected = new IScope[count];
54
55      // create a list for each scope that contains the scope's index in the original scope list
56      var temp = qualities.Select((x, index) => new { index, x.Value });
57      if (maximization)
58        temp = temp.OrderByDescending(x => x.Value);
59      else
60        temp = temp.OrderBy(x => x.Value);
61      var list = temp.ToList();
62
63      if (copy) {
64        int j = 0;
65        for (int i = 0; i < count; i++) {
66          selected[i] = (IScope)scopes[list[j].index].Clone();
67          j++;
68          if (j >= list.Count) j = 0;
69        }
70      } else {
71        for (int i = 0; i < count; i++) {
72          selected[i] = scopes[list[0].index];
73          scopes[list[0].index] = null;
74          list.RemoveAt(0);
75        }
76        scopes.RemoveAll(x => x == null);
77      }
78      return selected;
79    }
80  }
81}
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